MailMessage m = new MailMessage
  (\"item@phpstudy.net\",
  \"raja@phpstudy.net\",
  \"This is the subject for the authorized email.\",
  \"This is the body of the authorized mail!...\");
// Send the message using authorization
SmtpClient client = new SmtpClient(\"smtp.phpstudy.net\");
client.Credentials = new NetworkCredential(\"user\", \"password\");
client.EnableSsl = true;
// Add the event handler
client.SendCompleted += new SendCompletedEventHandler(mail_SendCompleted);
// Send the message asynchronously
client.SendAsync(m, null);
// To Cancel the send
//client.SendAsyncCancel();
void mail_SendCompleted(object sender, AsyncCompletedEventArgs e)
{
  if (e.Cancelled)
    Console.WriteLine(\"Message cancelled\");
  else if (e.Error != null)
    Console.WriteLine(\"Error: \" + e.Error.ToString());
  else
    Console.WriteLine(\"Message sent\");
}